fix(core): Avoid double counting cached input tokens for Vercel AI SDK v6#21488
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…K v6 The AI SDK v6 reports `ai.usage.inputTokens` as a cache-inclusive total, but our integration adds the cache-read count on top which is correct for <v6. We distinguish between v6 and pre-v6 SDKs by the presence of `ai.usage.inputTokenDetails.*` attributes and skip adding the cached count. Closes: #21484
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chargome
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Jun 12, 2026
obostjancic
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The AI SDK v6 reports
ai.usage.inputTokensas a cache-inclusive total, but our integration adds the cache-read count on top which is correct for <v6.We distinguish between v6 and pre-v6 SDKs by the presence of
ai.usage.inputTokenDetails.*attributes and skip adding the cached count.Closes: #21484